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Probe B was one of three probes launched from the USS Rio Grande when it was scanning an unnamed star system in the Gamma Quadrant for the missing USS Yangtzee Kiang. The probe was equipped with a differential magnetometer, so it could pick up a fluctuation in the hysteresis curve. This curve, caused by the interaction of the magnetic field with metallic composites in the Danube-class hull, would be used to find the Yangtze Kiang in the system.